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Sensors (Basel). 2016 Feb 26;16(3):295. doi: 10.3390/s16030295.

Outage Performance Analysis of Relay Selection Schemes in Wireless Energy Harvesting Cooperative Networks over Non-Identical Rayleigh Fading Channels.

Author information

1
Department of Electronics and Computer Engineering in Graduate School, Hongik University, Sejong 30016, Korea. dotrinhu@gmail.com.
2
Department of Wireless Communications, Posts and Telecommunications Institute of Technology, Ho Chi Minh City 710372, Vietnam. baovnq@ptithcm.edu.vn.
3
Department of Computer and Information Communications Engineering, Hongik University, Sejong 30016, Korea. beongku@hongik.ac.kr.

Abstract

In this paper, we study relay selection in decode-and-forward wireless energy harvesting cooperative networks. In contrast to conventional cooperative networks, the relays harvest energy from the source's radio-frequency radiation and then use that energy to forward the source information. Considering power splitting receiver architecture used at relays to harvest energy, we are concerned with the performance of two popular relay selection schemes, namely, partial relay selection (PRS) scheme and optimal relay selection (ORS) scheme. In particular, we analyze the system performance in terms of outage probability (OP) over independent and non-identical (i.n.i.d.) Rayleigh fading channels. We derive the closed-form approximations for the system outage probabilities of both schemes and validate the analysis by the Monte-Carlo simulation. The numerical results provide comprehensive performance comparison between the PRS and ORS schemes and reveal the effect of wireless energy harvesting on the outage performances of both schemes. Additionally, we also show the advantages and drawbacks of the wireless energy harvesting cooperative networks and compare to the conventional cooperative networks.

KEYWORDS:

best relay selection; cooperative networks; decode-and-forward; i.n.i.d. Rayleigh fading; power splitting; wireless energy harvesting

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